Hi, Viktor. I have some questions. I didn't find docs on such functions as SSL_get0_param Why there is no corresponding functions as SSL_set0_param in your code? Where can I found documentation on functions operating with params? I found only this code: X509_VERIFY_PARAM *param; param = X509_VERIFY_PARAM_new(); X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK); SSL_CTX_set1_param(ctx, param); X509_VERIFY_PARAM_free(param); here: https://www.openssl.org/docs/crypto/X509_VERIFY_PARAM_set_hostflags.html But there is no any description how SSL_CTX_set1_param works! Does it clear all previous flags on CTX or "ORing" with them? And there are no any docs on "GET" params functions! For example, like docs on SSL_CTX_set_options,SSL_CTX_get_option,SSL_set_options,SSL_get_options. -- Best Regards, Serj 25.01.2015, 20:59, "Viktor Dukhovni" <openssl-users at dukhovni.org>: > On Sun, Jan 25, 2015 at 07:43:14PM +0300, Serj wrote: >> ?What is the best way to make hostname validation? >> >> ?1. http://wiki.openssl.org/index.php/Hostname_validation >> ?2. X509_check_host that was added in OpenSSL 1.1.0. > > The X509_check_host() interface is also available in OpenSSL 1.0.2 > released a few days ago > > ????https://www.openssl.org/docs/crypto/X509_check_host.html > > (the documentation should be updated to note the earlier availability). > > Starting with 1.0.2, you can also ask OpenSSL to automatically > perform hostname checks during the SSL handshake on the application's > behalf: > > ????https://www.openssl.org/docs/crypto/X509_VERIFY_PARAM_set_hostflags.html > ????https://www.openssl.org/docs/crypto/X509_VERIFY_PARAM_set1_host.html > ????https://www.openssl.org/docs/crypto/X509_VERIFY_PARAM_add1_host.html > ????https://www.openssl.org/docs/ssl/SSL_set_verify.html > > Sadly, we're still lacking documentation of SSL_get0_param() which > is needed for a complete SSL hostname check recipe: > > ????????const char *servername; > ????????SSL *ssl; > ????????X509_VERIFY_PARAM *param; > > ????????servername = "www.example.com"; > ????????ssl = SSL_new(...); > ????????param = SSL_get0_param(ssl); > > ????????/* Enable automatic hostname checks */ > ????????X509_VERIFY_PARAM_set_hostflags(param, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS); > ????????X509_VERIFY_PARAM_set1_host(param, servername, 0); > > ????????/* Configure a non-zero callback if desired */ > ????????SSL_set_verify(ssl, SSL_VERIFY_PEER, 0); > > ????????/* > ?????????* Establish SSL connection, hostname should be checked > ?????????* automatically test with a hostname that should not match, > ?????????* the connection will fail (unless you specify a callback > ?????????* that returns despite the verification failure. ?In that > ?????????* case SSL_get_verify_status() can expose the problem after > ?????????* connection completion. > ?????????*/ > ?????????... >> ?I don't know does the first one support wildcards or no! Seems >> ?to be: how does Curl_cert_hostcheck work - is the answer, but I >> ?don't know how it works. > > Wildcard support is configured via the flags documented for X509_check_host(), > the two most frequently useful are: > > ????????X509_CHECK_FLAG_NO_WILDCARDS > ????????X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS > > -- > ????????Viktor. > _______________________________________________ > openssl-users mailing list > To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
